We discuss the influence of fracture-block structures on the distribution of radionuclides in the bottom sediments in the Kiev water storage reservoir studied from the analysis of space images and topographic maps of the reservoir bottom. It is shown that the methods for the investigation of tectonic structures described here may be used to analyses the storage and redistribution of radionuclides in the bottom sediments of other water storage reservoirs of the Dnipro cascade and other water bodies.